I KNEW you were too bright to believe that horseshit. Even if your gun shoots the wrong way. Marines, always using the guns that fire backwards. I mean, I knew you guys liked being shot at, but that's just silly!

Herodotus is the only guy that has some beef on him, and he said he ran from Athens to Sparta. Somebody else just jazzed up the legend, I suppose.

Triathletes will often do two of the three in the same day, several times a week. You just need to build up to it first, and accept the fact that doing so much cardio will make you look like a skeleton and probably get shin splints and bad knees.

Not even marathon runners do distance work every day. They have at least one day of the week where they run a light warmup. The lighter run stimulates blood to their muscles and is thought to speed recovery from the stresses of prior harder workouts.

People can AND do interval workouts where they will sprint and get their heartrates up VERY high, but they counterbalance that with a period of lighter activity before doing it again. They might sprint for 30 seconds OR run at a higher pace for 2-3 minutes, then walk or slowly jog.